Essential oils are concentrated plant extracts. Plants are made up of structural materials and phytochemicals. These chemicals have properties have been found to be beneficial to the individuals well-being and various methods have been devised to remove these properties from the plants that are beneficial to people. We have used essential oils in aromatherapy for thousands of years. Ancient cultures in China, India, Egypt, and elsewhere incorporated aromatic plant components in resins, balms, and oils. These natural substances were used for medical and religious purposes. They were known to have both physical and psychological benefits.